2 pin description, 1 power and ground, 1 power – Cirrus Logic CS4953xx User Manual
Page 98: 2 ground, 2 pin description -10, 1 power and ground -10, 1 power -10 9.2.1.2 ground -10, Table 9-1. core supply pins -10, Table 9-2. i/o supply pins -10
Pin Description
CS4953xx Hardware User’s Manual
DS732UM10
Copyright 2010 Cirrus Logic, Inc
9-10
9.2 Pin Description
9.2.1 Power and Ground
The following sections describe the CS4953xx power and ground pins. Decoupling and conditioning of the
power supplies is also discussed. Following the recommendations for decoupling and power conditioning
will help to ensure reliable performance.
9.2.1.1 Power
The CS4953xx Family of DSPs take two supply voltages — the core supply voltage (VDD) and the I/O
supply voltage (VDDIO). There is also a separate analog supply voltage required for the internal PLL
(VDDA). These pins are described in the following tables and descriptions.
The DSP Core supply voltage pins require a nominal 1.8V. The DSP I/O supply voltage pins require a
nominal 3.3V.
9.2.1.2 Ground
For two-layer circuit boards, care should be taken to have sufficient grounding between the DSP and parts
in which it will be interfacing (DACs, ADCs, S/PDIF Receivers, microcontrollers, and especially external
Table 9-1. Core Supply Pins
LQFP-144
Pin #
LQFP-128
Pin #
Pin Name
Pin Type
Pin Description
10
42
VDD1
Input
1.8V DSP Core supply.
This powers all internal logic
and the on-chip SRAMs and
ROMs
24
55
VDD2
54
83
VDD3
66
95
VDD4
83
112
VDD5
98
125
VDD6
119
12
VDD7
130
22
VDD8
Table 9-2. I/O Supply Pins
LQFP-144
Pin #
LQFP-128
Pin #
Pin Name
Pin Type
Pin Description
18
50
VDDIO1
Input
3.3V I/O supply
33
62
VDDIO2
44
73
VDDIO3
60
89
VDDIO4
73
100
VDDIO5
91
120
VDDIO6
113
8
VDDIO7
136
28
VDDIO8